Hydrated and Anhydrous Substances

Q. When gypsum is heated to 393 K, it forms

1. $CaS{O}_4.0.5H_{2}O$
2. Dead burnt plaster
3. $CaS{O}_4.5H_{2}O$
4. $AnhydrousCaS{O}_4$

Q.

(a) Why does common salt get wet during the rainy season ?

(b) How can this impurity be removed ?

(c) Name a substance which changes the blue colour of copper sulphate crystals to white.

(d) Name two crystalline substances which do not contain water of crystallisation.

Q.

Some salts while crystallising out from their solution, unite with a definite quantity of water which is known as _________.

1. hygroscopic substance

2. water of crystallisation

3. drying agent

4. efflorescence

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> What is the chemical formula of Calamine?

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> What is the chemical formula of Calamine?

Q.

A substance that doesn't contain water is called___ .substance

Q. Choose the correct combination of compounds and their respective water of crystallisation from the options given below.